Let me share the ugly truth: the majority of HVAC failures occur because someone skipped a step. Did not calculate the load properly. Used undersized equipment. Misjudged the insulation needs. We've personally fixed dozens of these failures. And each time, we remember another learning. Like in 2017, when we started adding WiFi controls to every install. Why? Because Sarah, our senior tech, got tired of watching homeowners burn money on inefficient temperature management. Now clients save 20-30% yearly.